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阅读下面的材料，试评价杜郎口中学教学模式的优缺点。杜郎口中学是位于山东偏远农村的一所初级中学，通过教改迅速成为教学改革的先进典范，其主要经验是“三三六”自主学习教学模式，第一个三是指整体性教学的三个特点：立体式，大容量，快节奏；第二个三是指自主学习三个模块：预习一展示一反馈；六是指展示模块的六个环节：预习交流、明确目标、分组合作、展现提升、穿插巩固、达标测评。该模式在实际操作中具体表现为“10+35”，即在一节课中教师课堂讲授时间不多于10分钟，学生自主学习时间不少于35分钟。

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A certain species of bird has two basic varieties, crested and noncrested. The birds, which generally live in flocks that contain only crested or only noncrested birds, tend to select mates of the same variety as themselves. However, if a bird that is raised in a flock in which all other members are crested is later moved to a mixed flock, then that bird—whether crested or noncrested—is likely to select a crested mate. This fact indicates that the birds preference for crested or noncrested mates is learned rather than genetically determined. Which one of the following, if true, provides the most support for the argument？

A. Birds of other species also tend to show preferences for mates that have one or another specific physical feature.
B. In general there are few behavioral differences between the crested and noncrested birds of the species.
C. Both the crested and noncrested birds of the species tend to select mates that are similar to themselves in size and age.
D. If a crested bird of the species is raised in captivity apart form. other birds and is later moved to a mixed flock, that bird is likely to select a crested mate.
E. If a bird of the species is raised in a flock that contains both crested and noncrested birds, that bird shows no preference for one variety or the other in its selection of a mate.

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2011年我国全年完成邮政业务总量大约为多少亿元？()

A. 1859
B. 1732
C. 1608
D. 1588

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随着清明、端午等传统节日的相继到来，各地公祭之风又起，甚至出现了“伏羲东奔西走，黄帝到处安家。诸葛四处显灵，女娲遍地开花”的热闹场面，政府官办清明、端午等传统节日，对此你怎么看？

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做相关研究和比较研究，最有效的样本容量是每组至少()。

A. 100
B. 15
C. 30
D. 150

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